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The removal of the side splitters is straightforward. At the bottom of the part there are screws which are screwed into the bumper. All you need to do is unscrew and that part will come off from the bumper. Crawl underneath if you don't have a lift and you will see the screws which you need to be removed in order to disassemble this part.
Those little side splitters are held on with 4 X 8mm (maybe 10 mm??) hex head screws/bolts each side.
The screws/bolts are identical and all the same length.
They screw into the plastic bumper cover so go easy when refitting them and don't over-torque them.
Also, if you remove and refit them many times like I have the mounting holes can become a little wallered out so again take it easy.
I largely fixed this problem by wrapping the thread of each screw with a bit of electrical tape.
I pulled mine off last month to paint them the same color as the body and it was a piece of cake basically. I also painted the front lip the same color to be more like a 2018 model design, then wrapped it in clear ppf since that lip can get a lot of abuse from rogue gravel. 2016 with color matched lip and side splitters
I want to do similar, I want to have side splitters in color, but the middle section in black, because I have black side sills and black diffusor so to have a balance. I never liked that "cut-out" around side splitters, especially on photos where black splitters tend to disappear and then the front looks weird to me.